A very long straight wire of radius $ r $ carries current $ I $. Intensity of magnetic field $ B $ at a point lying at a perpendicular distance $ a $ from the axis is $ \propto $ (where $ a

Question

A very long straight wire of radius $ r $ carries current $ I $. Intensity of magnetic field $ B $ at a point lying at a perpendicular distance $ a $ from the axis is $ \propto $ (where $ a < r $ )., $ 1 / a $, $ 1 / a^{2} $, $ a^{2} $, $ a $

MARKS App · Accepted Answer

Magnetic field inside a wire is given by, B = μ 0 i a 2 π r 2 ⇒ B ∝ a

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